Dynamic Balance Technology of Inverter Controller Rotary Compressor

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1 Purdu Univrsity Purdu -Pubs Intrntionl Corssor Enginring Confrnc School of Mchnicl Enginring 2010 Dynic Blnc Tchnology of Invrtr Controllr Rotry Corssor Jining Hung Gr Elctric Alincs Yushng Hu Gr Elctric Alincs Sihi Xi Gr Elctric Alincs Liing Rn Gr Elctric Alincs Follow this nd dditionl works t: htts://docs.lib.urdu.du/icc Hung, Jining; Hu, Yushng; Xi, Sihi; nd Rn, Liing, "Dynic Blnc Tchnology of Invrtr Controllr Rotry Corssor" (2010). Intrntionl Corssor Enginring Confrnc. Pr htts://docs.lib.urdu.du/icc/1949 This docunt hs bn d vilbl through Purdu -Pubs, srvic of th Purdu Univrsity Librris. Pls contct ubs@urdu.du for dditionl infortion. Colt rocdings y b cquird in rint nd on CD-ROM dirctly fro th Ry W. Hrrick Lbortoris t htts://nginring.urdu.du/ Hrrick/Evnts/ordrlit.htl

2 , Pg 1 Dynic Blnc Tchnology of Invrtr Controllr Rotry Corssor Jining Hung, Yushng Hu, Sihi Xi, Liing Rn Corssor nd Motor Institut of Gr Elctric Alinc, Inc. of Zhuhi, Jinji Wst Rd., Zhuhi City, , P. R. Chin Phon: , Fx: , E-il: hj_jn@163.co ABSTRACT Rottionl iblnc is on of th fctors tht ffct th nois nd vibrtion of invrtr controllr rotry corssor. Th ffct is srious s rsult of highr sd. Th rotor syst of th corssor is tkn s study objct in th r. Introducing dynic blnc cofficint ccording th ffct of th flxibility of crnkshft, chnics quilibriu qution is built u. Bcus th ffct of dynic blnc lis on ir of rsonbl blnc wights, rtr otiizd thod for dsigning blnc is rsntd. Exrint is rford, nd it is shown tht th tchnology cn b usd to rduc th nois cusd by rottionl iblnc. 1. INTRODUCTION Th ccntric rt of crnkshft inducs cntrifugl inrti forc tht cuss th iblnc issu of corssor, such s th robl of nois nd vibrtion. Th trditionl solving thod is to dd ir of blncrs in th ur nd lowr sid of th rotor considring th crnkshft to b rigid. Howvr, whn th trditionl thod is lid to th highr rottion sd of rotry corssors, th lvl of nois nd vibrtion is not idl. As for rotry corssors, th rduction of nois nd vibrtion is vry iortnt. This r studis dynic blnc tchnology for n invrtr controllr rotry corssor to rduc its nois nd vibrtion. In ordr to study on th blnc syst of rotry corssor, th rotor syst is constitutiv of crnkshft quid with rollr, otor rotor, nd ir of blncrs, s shown in Figur 1. Firstly, th dfortion of th crnk shft of n invrtr controllr rotry corssor is nlyzd. Scondly, dfining dynic blnc cofficint ccording th ffct of th flxibility of crnk shft, chnics quilibriu qution is built u. A thod is stblishd for blnc dsign tht tks into ccount crnkshft flxibility throughout th orting sd rng. Thirdly, nois nd vibrtion xrints of corssors r rford to vrify th dynic blnc tchnology. Figur 1: Rotry corssor nd rotor syst Intrntionl Corssor Enginring Confrnc t Purdu, July 12-15, 2010

3 , Pg 2 2. CHARACTERISTICS OF CRANK SHAFT A ir of ddy currnt ty g snsor r usd to sur crnk shft dfortion in th X xis nd Y xis dirctions, s shown in Figur 2. Figur 3 shows n xl of th suring rsult of th rottion locus of th to of crnk shft, which bcos lik circl. Orbit surnts r rford for diffrnt sds of rottion within th rng of r. Th xiu lituds of th orbits vrsus sds of rottion r lottd in Figur 4. Th countrwight sss loctd t th to nd th botto of th rotor induc rdil forcs on th crnk shft, which bnds xonntilly with th sd of rottion. Th xiu dflction of th crnkshft t n ortion sd of 5400 r is or srious thn it t sd of 3000 r. By rson of this, th crnk shft of n invrtr controllr rotry corssor is unsuitbl to b rgrdd s rigid body. Whn ir of blncrs of n invrtr controllr rotry corssor is dsignd, th dfortion th crnk shft should b considrd. Th dflction of th crnkshft is clcultd bsd on FEM nlysis odl, s shown in Figur 5. Considring thr diffrnt lod css, such s Figur 2: Exrintl stu Figur 3: No dinsionl orbits t 3600 r Figur 4: Msurd dflction vrsus sd of rottion Th dflction of th crnkshft is clcultd bsd on FEM nlysis odl, s shown in Figur 5. Considring thr diffrnt lod css, such s cntrifugl inrti forc, iblnc gntic forc nd gs forc, th dflctions vrsus sd of rottion r clcultd, s shown in figur 6. Th rsults show tht both th cntrifugl inrti forc nd th iblnc gntic forc r two doinnt fctors which ffct th dflction of th crnkshft. Th dflction cusd by th cntrifugl inrti forc rsults in n iblnc gntic forc, nd th iblnc gntic forc worsns th dflction of th crnkshft. So n ir of rorit blnc wights r rquird for n invrtr controllr rotry corssor. Intrntionl Corssor Enginring Confrnc t Purdu, July 12-15, 2010

4 , Pg 3 Figur 5: FEM Anlysis odl Figur 6: Clcultd Dflction vrsus sd of rottion 3. FORMULATIONS AND DISCUSSIONS Considring th ffct of th flxibility of crnkshft, s shown in figur 7, chnics quilibriu qution is built u s follows. L whr, L nd L L L L 0 0 r th distncs fro th ss cntr of in blnc wight, n uxiliry blnc wight (1) nd rotor to th ss cntr of crnkshft ccntric rt, rsctivly., nd r th sss of in blnc wight, n uxiliry blnc wight, rotor nd crnkshft ccntric rt rsctivly., nd r ccntricitis of in blnc wight, n uxiliry blnc wight nd crnkshft ccntric rt rsctivly. N & V r indxs of th nois nd vibrtion of corssor., nd r th unblnc quntitis of in blnc wight, n uxiliry blnc wight nd crnkshft ccntric rt rsctivly. nd r th dfortions of th crnkshft corrsonding to th ss cntr of in blnc wight, n uxiliry blnc wight nd rotor. Figurs 7 Schtic of chnics syst Intrntionl Corssor Enginring Confrnc t Purdu, July 12-15, 2010

5 Dfin dynic blnc cofficint ccording th ffct of th flxibility of crnkshft s follows: s 1 d L 1 L L L, Pg 4 Th chnics quilibriu qution cn b dducd fro qution (1) cobind with qutions (2) nd (3) s follows: s 0 L dl 0 Th robl of blnc dsign of rotry corssor cn b lookd uon robl of otiiztion dsign. It is dscribd s follows: Subjct to Bounds on Miniiz N & L V d s 0 L 0 0.1,0.1, 4,4 0,0, 2.0, EXPERIMENT RESULTS Two diffrnt ty corssors countrwights r studid, nd th corssors r nd Ty 1 nd Ty 2 rsctivly. Ty 1 corssor is quid with distributd winding otor, nd thr diffrnt dynic blnc cofficints r ssud for ir of blnc wights of th ty 1 corssor, which r rcordd roto ty A, B nd C rsctivly. Ty 2 corssor is quid with concntrtd winding otor, nd thr diffrnt dynic blnc cofficints r ssud for ir of blnc wights of th ty 2 corssor, which r rcordd roto ty H, I nd J rsctivly. A vibrtion xrint on ths corssors is don. An cclrotr is ountd on th botto of corssor, nd th rdil cclrtion of corssor is surd, s shown in Figur 8. Also, sris of nois xrint r don. Th thod of tn icrohons is dotd nd sound owr surnt is instlld s Figur 9. Nois nd vibrtion xrints of ty 1 corssors r conductd. Th rdil vibrtion nd nois surnt rsults r shown in Figur 10 nd Figur 11 rsctivly. Also, nois xrint is conductd on ty 2 corssor, nd th nois surnt rsults r shown in Figur 12. Th xrint rsults show tht: (1).As for Ty 1 corssor, th nois nd vibrtion lvl of roto ty B is th bst. Coring with th roto ty A, th vibrtion rduction of roto ty B hs bn rducd by 7~10 /s 2, th nois rduction of roto ty B hs bn rducd by 1~3 db(a) t th sd of 3600~5400 r. (2).As for Ty 2 corssor, th nois lvl of roto ty I is th bst. Coring with th roto ty H, th 3~4 db(a) nois rduction of roto ty I hs bn chivd t th sd of 2400~4200 r. s d (2) (3) (4) (5) Intrntionl Corssor Enginring Confrnc t Purdu, July 12-15, 2010

6 , Pg 5 Figur 8: Vibrtion Msurnt Figur 9: Sound Powr Msurnt Figur 10: Rdil Acclrtion of Ty 1 Figur 11: Sound Powr of Ty 1 Intrntionl Corssor Enginring Confrnc t Purdu, July 12-15, 2010

7 , Pg 6 Figur 12: Sound Powr of Ty 2 5. CONCLUSIONS A crnkshft dflction of n Invrtr Controllr Rotry Corssor is studid, nd th crnk shft is unsuitbl to b rgrdd s rigid body. Whn ir of blncrs of n invrtr controllr rotry corssor is dsignd, th dfortion th crnk shft should b considrd. A rtr otiizd thod for dsigning blnc is rsntd. Th blnc systs of two ty corssors r studid. Thr is n rorit dynic blnc cofficint for n Invrtr Controllr Rotry Corssor, which cn b usd to rduc th nois nd vibrtion cusd by rottionl iblnc. REFERENCES L. Mrriot, 1994, Finit lnt clcultion of rotor sidull forcs in singl-hs induction otors, Procdings Purdu Corssor Tchnology Conf., Frdric sv, Alin Brlioz, Rgis Dufour, 2000, On th Unblnc Rsons of Rotry Corssor, Procdings Purdu Corssor Tchnology Conf., Frdric sv, Alin Brlioz, Rgis Dufour, 2000, Exrintl nd Prdictd Unblnc Rsons of Rotry Corssor Crnkshft, Procdings Purdu Corssor Tchnology Conf., Jining Hung, Huijun Wi, Yushng Hu, Ouxing Yng, 2008, Study on Blnc Syst of Rotry Corssor, Procdings Purdu Corssor Tchnology Conf., 1232: 1-7. Intrntionl Corssor Enginring Confrnc t Purdu, July 12-15, 2010